Strange "whistle" noise after front brake job - Drive Accord Honda Forums

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Old 05-30-2009, 05:48 PM
kikboxr1 kikboxr1 is offline
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Strange "whistle" noise after front brake job

Today I did a front brake job - 2001 V6 Accord EX - complete with new pads and resurfaced rotors. There was one goof in the process.

Me, being the goofball that I am, had my dad apply the brake pedal to lock the wheels while I was removing the rotor screws, not realizing that I had already removed the pads. He pushed the pedal all the way to the floor. I didn't think anything of it at the time - just compressed the caliper piston back in and went back to work.

When I went to put the freshly resurfaced rotors back on, I noticed an alarming amount - 4-5 oz - of brake fluid that had spilled on the floor (I had not flushed or added any fluid). On closer inspection, I saw it came from the area where the master cylinder meets the brake booster. I cleaned the leaked fluid off and went back to work.

When the job was finished, we went to test drive / seat the pads, and every time I applied the brakes I heard this whistle-like sound from the driver front of the car. It sounds like a bottle rocket taking off (before the bang).
After a long 30 mile drive, the brakes function great, but the noise is still there. No more leaks around the booster, but I'm concerned due to the noise.

I plan to bleed the brakes next weekend. Any ideas on where I should start if that doesn't take away the odd whistle noise?
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Old 05-31-2009, 05:09 PM
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Did any of the clips in the caliper bracket get bent into the rotor? It doesn't take much to have one bend and just barely touch, then when you push the pedal, it drags on the rotor surface.

The fluid you saw was probably overflow, when you push the pistons back in, the fluid has to go somewhere.
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Old 05-31-2009, 07:42 PM
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Did the leak occur because you had to push the piston back out? From what I read on this forum (i think it was here), you need to take the cap off the brake reservoir before pushing out/in the caliper.

Next question, did it leak out from some sort of overflow valve?
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Old 06-01-2009, 03:55 AM
kikboxr1 kikboxr1 is offline
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Interesting - it could have happened when I pushed the piston back in. It was leaking all around the area where the MC meets the brake booster, so I don't know if that's normal or not. I definitely had the reservoir cap on when I was pushing the caliper back in.
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Old 06-01-2009, 04:35 PM
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the cap doesn't completely seal, it's vented so the fluid will push back out the top.

It's very hard to get it to leak between the master and booster, there's a seal in there and the master goes into the booster about 1.5" or so.

Normally any fluid will just pour into the booster, and when you start the car, it will burn the fluid that gets sucked into the intake through the vacuum hose.
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Vermilion 1999 SVT F150 Lightning, Sylvania/Visteon Xenarc HID headlamps, '01 L turn/marker lamps, PIAA fogs, '01 up Bilstein shocks, all Pioneer speakers, Clarion subwoofer. All Redline fluids.

Silverstone 2003 Honda S2000, bone stock
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